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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.associated_cancellation_slot"></a><a class="link" href="associated_cancellation_slot.html" title="associated_cancellation_slot">associated_cancellation_slot</a>
</h3></div></div></div>
<p>
        <a class="indexterm" name="boost_asio.indexterm.associated_cancellation_slot"></a>
      </p>
<p>
        Traits type used to obtain the <a class="link" href="cancellation_slot.html" title="cancellation_slot"><code class="computeroutput"><span class="identifier">cancellation_slot</span></code></a> associated with
        an object.
      </p>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
    <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span>
    <span class="keyword">typename</span> <a class="link" href="CancellationSlot.html" title="Cancellation slot requirements">CancellationSlot</a> <span class="special">=</span> <span class="identifier">cancellation_slot</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">associated_cancellation_slot</span>
</pre>
<h5>
<a name="boost_asio.reference.associated_cancellation_slot.h0"></a>
        <span class="phrase"><a name="boost_asio.reference.associated_cancellation_slot.types"></a></span><a class="link" href="associated_cancellation_slot.html#boost_asio.reference.associated_cancellation_slot.types">Types</a>
      </h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  Name
                </p>
              </th>
<th>
                <p>
                  Description
                </p>
              </th>
</tr></thead>
<tbody><tr>
<td>
                <p>
                  <a class="link" href="associated_cancellation_slot/type.html" title="associated_cancellation_slot::type"><span class="bold"><strong>type</strong></span></a>
                </p>
              </td>
<td>
                <p>
                  If T has a nested type cancellation_slot_type, T::cancellation_slot_type.
                  Otherwise CancellationSlot.
                </p>
              </td>
</tr></tbody>
</table></div>
<h5>
<a name="boost_asio.reference.associated_cancellation_slot.h1"></a>
        <span class="phrase"><a name="boost_asio.reference.associated_cancellation_slot.member_functions"></a></span><a class="link" href="associated_cancellation_slot.html#boost_asio.reference.associated_cancellation_slot.member_functions">Member
        Functions</a>
      </h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  Name
                </p>
              </th>
<th>
                <p>
                  Description
                </p>
              </th>
</tr></thead>
<tbody><tr>
<td>
                <p>
                  <a class="link" href="associated_cancellation_slot/get.html" title="associated_cancellation_slot::get"><span class="bold"><strong>get</strong></span></a> <span class="silver">[static]</span>
                </p>
              </td>
<td>
                <p>
                  If T has a nested type cancellation_slot_type, returns t.get_cancellation_slot().
                  Otherwise returns type(). <br> <span class="silver"> —</span><br> If T has a nested type
                  cancellation_slot_type, returns t.get_cancellation_slot(). Otherwise
                  returns s.
                </p>
              </td>
</tr></tbody>
</table></div>
<p>
        A program may specialise this traits type if the <code class="computeroutput"><span class="identifier">T</span></code>
        template parameter in the specialisation is a user-defined type. The template
        parameter <code class="computeroutput"><span class="identifier">CancellationSlot</span></code>
        shall be a type meeting the CancellationSlot requirements.
      </p>
<p>
        Specialisations shall meet the following requirements, where <code class="computeroutput"><span class="identifier">t</span></code> is a const reference to an object of
        type <code class="computeroutput"><span class="identifier">T</span></code>, and <code class="computeroutput"><span class="identifier">s</span></code> is an object of type <code class="computeroutput"><span class="identifier">CancellationSlot</span></code>.
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            Provide a nested typedef <code class="computeroutput"><span class="identifier">type</span></code>
            that identifies a type meeting the CancellationSlot requirements.
          </li>
<li class="listitem">
            Provide a noexcept static member function named <code class="computeroutput"><span class="identifier">get</span></code>,
            callable as <code class="computeroutput"><span class="identifier">get</span><span class="special">(</span><span class="identifier">t</span><span class="special">)</span></code>
            and with return type <code class="computeroutput"><span class="identifier">type</span></code>
            or a (possibly const) reference to <code class="computeroutput"><span class="identifier">type</span></code>.
          </li>
<li class="listitem">
            Provide a noexcept static member function named <code class="computeroutput"><span class="identifier">get</span></code>,
            callable as <code class="computeroutput"><span class="identifier">get</span><span class="special">(</span><span class="identifier">t</span><span class="special">,</span><span class="identifier">s</span><span class="special">)</span></code>
            and with return type <code class="computeroutput"><span class="identifier">type</span></code>
            or a (possibly const) reference to <code class="computeroutput"><span class="identifier">type</span></code>.
          </li>
</ul></div>
<h5>
<a name="boost_asio.reference.associated_cancellation_slot.h2"></a>
        <span class="phrase"><a name="boost_asio.reference.associated_cancellation_slot.requirements"></a></span><a class="link" href="associated_cancellation_slot.html#boost_asio.reference.associated_cancellation_slot.requirements">Requirements</a>
      </h5>
<p>
        <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/associated_cancellation_slot.hpp</code>
      </p>
<p>
        <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code>
      </p>
</div>
<div class="copyright-footer">Copyright © 2003-2025 Christopher M.
      Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
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